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Masimo (MASI) Institutional Ownership

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Institutional Ownership Changes (13F Filings) for Masimo (NASDAQ:MASI)

Current
Institutional Ownership
Percentage
85.96%
Number of
Institutional Buyers
(last 12 months)
221
Total
Institutional Inflows
(last 12 months)
$1.77B
Number of
Institutional Sellers
(last 12 months)
126
Total
Institutional Outflows
(last 12 months)
$1.22B
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MASI Institutional Buying and Selling by Quarter

Masimo Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
6/24/2026Redwood Investment Management LLC5,835$1.04M0.1%-30.8%0.011%
6/18/2026Pacer Advisors Inc.7,618$1.36M0.0%+3.5%0.015%
6/16/2026Empowered Funds LLC1,376$245K0.0%-14.2%0.003%
6/15/2026Carmignac Gestion64,831$11.53M0.2%N/A0.124%
6/3/2026NewEdge Advisors LLC1,827$325K0.0%+1,531.3%0.003%
6/1/2026Caerus Investment Advisors LLC1,526$271K0.1%N/A0.003%
6/1/2026Keel Point LLC1,228$218K0.0%N/A0.002%
5/21/2026 Essential Partners LLC1,183$210K0.1%+33.4%0.002%
5/21/2026Groupe la Francaise31,950$5.68M0.1%N/A0.061%
5/20/2026Liontrust Investment Partners LLP20,138$3.58M0.1%-96.8%0.038%
5/19/2026Western Wealth Management LLC250$44K0.0%N/A0.000%
5/19/2026Bank of America Corp DE232,003$41.27M0.0%-18.5%0.443%
5/19/2026Bull Harbor Capital LLC2,151$383K0.1%N/A0.004%
5/19/2026South Dakota Investment Council17,568$3.13M0.1%-17.4%0.034%
5/18/2026Amundi243,143$43.25M0.0%+454.4%0.464%
5/18/2026EverSource Wealth Advisors LLC1,064$189K0.0%+9.0%0.002%
5/18/2026California State Teachers Retirement System53,287$9.48M0.0%+21.6%0.102%
5/18/2026Readystate Asset Management LP171,115$30.44M1.4%N/A0.327%
5/18/2026Royal Bank of Canada2,748$489K0.0%-75.8%0.005%
5/18/2026Empowered Funds LLC1,376$245K0.0%-14.2%0.003%
5/16/2026The Manufacturers Life Insurance Company 23,637$4.20M0.0%-28.8%0.045%
5/16/2026Quantinno Capital Management LP22,501$4.00M0.0%+69.8%0.043%
5/16/2026Whitebox Advisors LLC270,001$48.03M0.6%N/A0.516%
5/16/2026SummitTX Capital L.P.7,000$1.25M0.0%+336.7%0.013%
5/15/2026Weiss Asset Management LP112,600$20.03M0.3%N/A0.215%
5/15/2026Waverly Advisors LLC1,415$252K0.0%N/A0.003%
5/15/2026Kryger Capital LLC100,589$17.89M1.3%N/A0.192%
5/14/2026Healthcare of Ontario Pension Plan Trust Fund67,600$12.02M0.0%N/A0.129%
5/14/2026Renaissance Technologies LLC239,500$42.60M0.1%+299.8%0.457%
5/14/2026Gabelli Funds LLC126,082$22.43M0.2%+285.6%0.241%
5/14/2026GABELLI & Co INVESTMENT ADVISERS INC.88,650$15.77M2.3%N/A0.169%
5/14/2026Gamco Investors INC. ET AL92,000$16.36M0.2%+10.8%0.176%
5/14/2026Public Employees Retirement System of Ohio13,446$2.39M0.0%-3.1%0.026%
5/14/2026Arrowstreet Capital Limited Partnership172,588$30.70M0.0%N/A0.330%
5/14/2026Caxton Associates LLP45,917$8.17M0.2%N/A0.088%
5/14/2026Capula Management Ltd142,800$25.40M0.2%N/A0.273%
5/14/2026Bank of Nova Scotia152,584$27.14M0.0%+2,808.0%0.291%
5/14/2026Sei Investments Co.13,195$2.35M0.0%+71.0%0.025%
5/8/2026PNC Financial Services Group Inc.5,107$908K0.0%-29.9%0.010%
5/7/2026Dimensional Fund Advisors LP164,402$29.24M0.0%-5.5%0.315%
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5/7/2026Parallel Advisors LLC624$111K0.0%+119.7%0.001%
5/7/2026Swiss National Bank90,300$16.06M0.0%-0.9%0.173%
5/6/2026California Public Employees Retirement System77,397$13.77M0.0%+22.2%0.148%
5/6/2026 Assetmark Inc.2,068$368K0.0%+11.8%0.004%
5/6/2026Bessemer Group Inc.1,857$331K0.0%+1,217.0%0.004%
5/5/2026Bank of New York Mellon Corp306,400$54.50M0.0%-0.7%0.570%
5/5/2026Illinois Municipal Retirement Fund7,626$1.36M0.0%-32.9%0.014%
5/4/2026ABC Arbitrage SA23,604$4.20M0.6%N/A0.044%
5/4/2026Calamos Wealth Management LLC1,511$269K0.0%N/A0.003%
5/4/2026Calamos Advisors LLC1,511$269K0.0%N/A0.003%
5/4/2026State of Michigan Retirement System10,996$1.96M0.0%+1.9%0.020%
5/4/2026Principal Financial Group Inc.102,718$18.27M0.0%+5.0%0.191%
5/1/2026180 Wealth Advisors LLC2,728$485K0.1%+2.5%0.005%
5/1/2026Commonwealth of Pennsylvania Public School Empls Retrmt SYS18,940$3.37M0.0%+65.8%0.035%
5/1/2026Fifth Third Bancorp11,736$2.09M0.0%+1,934.0%0.022%
4/30/2026Hsbc Holdings PLC473,434$84.27M0.0%N/A0.881%
4/30/2026Oregon Public Employees Retirement Fund9,374$1.67M0.0%+3.3%0.017%
4/29/2026R Squared Ltd1,289$229K0.1%N/A0.002%
4/29/2026Credit Industriel ET Commercial23,050$4.10M0.3%N/A0.043%
4/29/2026Canvas Wealth Advisors LLC3,191$568K0.1%N/A0.006%
4/28/2026Hardy Reed LLC2,381$424K0.0%+9.6%0.004%
4/28/2026Praxis Investment Management Inc.1,773$315K0.0%N/A0.003%
4/27/2026HB Wealth Management LLC2,704$481K0.0%+15.7%0.005%
4/27/2026 New York State Teachers Retirement System38,569$6.86M0.0%-3.7%0.072%
4/25/2026Strs Ohio37,213$6.62M0.0%+0.8%0.069%
4/24/2026 Root Financial Partners LLC457$81K0.0%+7,516.7%0.001%
4/24/2026Capricorn Fund Managers Ltd22,811$4.06M0.6%N/A0.042%
4/22/2026Pictet Asset Management Holding SA7,020$1.25M0.0%+7.3%0.013%
4/22/2026 Sterling Capital Management LLC322$57K0.0%-97.0%0.001%
4/22/2026Ground Swell Capital LLC1,319$235K0.5%N/A0.002%
4/21/2026Pinnacle Wealth Management Advisory Group LLC1,324$236K0.0%N/A0.002%
4/21/2026 Louisiana State Employees Retirement System13,200$2.35M0.0%N/A0.025%
4/21/2026Silver Oak Securities Incorporated1,755$312K0.0%-10.2%0.003%
4/20/2026 Blue Trust Inc.232$41K0.0%-24.2%0.000%
4/20/2026 Fifth Third Wealth Advisors LLC1,528$272K0.0%N/A0.003%
4/17/2026 Krilogy Financial LLC1,879$335K0.0%-44.1%0.003%
4/17/2026 Andina Capital Management LLC1,420$253K0.2%N/A0.003%
4/16/2026SG Americas Securities LLC522,824$93.00M0.1%+3,082.3%0.973%
4/16/2026Evolve Private Wealth LLC1,713$305K0.0%N/A0.003%
4/16/2026Diversified Trust Co4,685$833K0.0%N/A0.009%
3/17/2026Rockefeller Capital Management L.P.86,411$11.24M0.0%-41.4%0.161%
3/9/2026Corient Private Wealth LLC340,230$44.25M0.1%+1.2%0.633%
3/3/2026Caitong International Asset Management Co. Ltd890$116K0.0%N/A0.002%
2/24/2026Pacer Advisors Inc.7,360$957K0.0%+21.1%0.014%
2/23/2026Virtu Financial LLC1,985$258K0.0%N/A0.004%
2/19/2026T. Rowe Price Investment Management Inc.2,330,158$303.06M0.2%+9.6%4.338%
2/19/2026Invesco Ltd.319,308$41.53M0.0%-0.6%0.595%
2/19/2026Corient Private Wealth LLC341,730$44.45M0.0%+1.6%0.636%
2/18/2026Mercer Global Advisors Inc. ADV10,862$1.41M0.0%N/A0.020%
2/18/2026Naya Capital Management UK Ltd.1,560,697$202.98M15.3%N/A2.906%
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2/18/2026State of Tennessee Department of Treasury13,918$1.91M0.0%-4.1%0.026%
2/18/2026Empowered Funds LLC1,603$208K0.0%-34.9%0.003%
2/18/2026XTX Topco Ltd12,746$1.66M0.0%N/A0.024%
2/18/2026nVerses Capital LLC2,067$269K0.6%N/A0.004%
2/18/2026Voloridge Investment Management LLC39,557$5.15M0.0%+1,281.7%0.074%
2/18/2026Wellington Management Group LLP7,832$1.02M0.0%+257.0%0.015%
2/18/2026SummitTX Capital L.P.1,603$208K0.0%N/A0.003%
2/18/2026Tudor Investment Corp ET AL16,242$2.11M0.0%-48.7%0.030%
2/18/2026Polymer Capital Management US LLC9,523$1.24M0.1%+62.1%0.018%
2/18/2026Occudo Quantitative Strategies LP9,663$1.26M0.1%+87.7%0.018%


MASI Institutional Ownership - Frequently Asked Questions

During the previous two years, 424 institutional investors and hedge funds held shares of Masimo. The most heavily invested institutionals were FMR LLC ($1.34B), Politan Capital Management LP ($677.20M), Vanguard Group Inc. ($565.60M), Massachusetts Financial Services Co. MA ($346.46M), T. Rowe Price Investment Management Inc. ($303.06M), Holocene Advisors LP ($209.20M), and Naya Capital Management UK Ltd. ($202.98M).Learn more on Masimo's institutional investors.

85.96% of Masimo's stock is owned by institutional investors. Learn more on MASI's institutional investor holdings.

Of the 368 institutional investors that purchased Masimo's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: FMR LLC ($3.31M), Massachusetts Financial Services Co. MA ($1.94M), Naya Capital Management UK Ltd. ($1.56M), Durable Capital Partners LP ($1.16M), Westfield Capital Management Co. LP ($1.11M), AQR Capital Management LLC ($1.11M), and Capital Research Global Investors ($1.09M).

Institutional investors have bought a total of 12,029,685 shares in the last 24 months. This purchase volume represents approximately $1.77B in transactions.

Of the 125 institutional investors that sold Masimo's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: T. Rowe Price Investment Management Inc. ($1.53M), Capital Research Global Investors ($1.22M), Alliancebernstein L.P. ($790.51K), Liontrust Investment Partners LLP ($607.66K), Viking Global Investors LP ($559.09K), Durable Capital Partners LP ($543.28K), and Vanguard Group Inc. ($461.23K).

Institutional investors have sold a total of 8,763,291 shares in the last 24 months. This volume of shares sold represents approximately $1.22B in transactions.


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Institutional ownership data for NASDAQ:MASI is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 6/24/2026. New 13F filings are added each quarter as they're published.
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